The Art of American Horology & Colle...

New York, Nov 28, 2001

LOT 67

Waltham, Mass., U.S.A., "Vanguard", Model 1908, No. 25340130, circa 1924.Very fine and very rare, 14K white gold-filled, keyless sidereal watch with 30-hour winding indicator and special hairspring.

USD 1,800 - 2,600

Sold: USD 3,680

C. three-body, "bassine" by Keystone, screwed bezel and back , straight line engine-turned back, partially engraved with floral pattern D. white enamel, bold Arabic numerals, outer minute ring, sunk subsidiary up/down at 12 o'clock, sunk subsidiary seconds. Blued steel "Heavy Double Swell Spade" hands. M. 16 size, nickel, bridge caliber, damascened, 23 jewels, the top ones in gold settings, gold center wheel, adjusted to 6 positions, straight line lever escapement, cut-bimetallic compensation baance with gold screws, blued steel Breguet balance spring, OHLSON micrometric regulator.Engraved on ratchet wheel "Lossier Inner Terminal Hair Spring".Signed on the dial, case and movement. Dial signed "Sidereal", "BU. Aero. U.S. Navy G.S.T." (Bureau of Aeronautics - U.S. Navy, Greenwich Sidereal Times)Diam. 51.6 mm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: 3*

Good

Overhaul recommended, at buyer's expense
Dial: 2-01

Very good

HANDS Original

Notes

Sidereal time is the time it takes the earth to make one full revolution around its axis. Since in practice it can be measured as the Earth's rotation with respect to distant celestial objects, it is called sidereal or star time (sider = star in Latin). The sidereal day is 23 hours 56 minutes and 41 seconds long. There is one more day in a sidereal year than in a solar year. Sidereal time is used for precise astronomical observations.